Recording optical system
US5031978A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1990 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | Aug 16, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/1135
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A recording optical system includes a semiconductor laser for emitting a light beam and a shutter device for changing the spot size of the light beam. The shutter device has a shutter array in which a plurality of shutter elements are arranged in a line, each of the shutter elements being controlled so as to be opened and shut in accordance with a gradational image. The recording optical system also has a deflection optical system for deflecting the light beam which passes through the shutter device and an image formation optical system for focusing the light beam which is deflected by the deflection optical system on a recording medium, so that the light beam scans the recording medium to form the image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.